Abstract: The influence factors of soil slope seismic stability are multifarious and their impact extents are also various. In this study, we discuss the effect degree of each factor, and the results show that the key influence factors are slope grade, slope height, slope structure type, rainfall, drainage distance, cohesion force, internal friction angle and ground motion parameters. The method of analytic hierarchy process (AHP) is introduced into this research to determine the weight of each key factor. Based on integrity, operability and applicability, factors with higher weights, which partition the slopes into four types, are selected as the indexes of soil slope division, and each type is further classified into four sub-types according to slope gradients, including gentle slope, gentle steep slope, steep slope and more steep slope. The results can provide a reference basis for the stability evaluation of soil slope under seismic action.